[GRASSLIST:5994] r.bitpattern usage

[Trevor Wiens]

Markus was kind enough to let me have r.bitpattern (which will show up in GRASS after the 6.0 release), but I'm a bit unsure of the usage. Perhaps either he or Radim can help me with a basic use question as I want to make sure I've got this right.

I'm processing MODIS data and the bit layout is 

x x x xx x x x xx xxxx xx

Now the bit of interest to me is in the 32 position which tells me if the vegetation index is still within the useful quality range.

>From my understanding I should run the command as follows:

r.bitpattern input=M2000.EVI.quality output=test pattern=32 patval=0 

This will check for a 0 value in the 6 position from the right and create a layer called "test" (in my example).
Now if the value of 0 IS found the output layer's pixel value will be 1.
If the value of 0 is NOT found, the output layer's pixel value will be 0.

Right?

T
-- 
Trevor Wiens 
twiens at interbaun.com

The significant problems that we face cannot be solved at the same 
level of thinking we were at when we created them. 
(Albert Einstein)